摘要
为有效控制列车移动荷载作用下大跨度悬索桥梁端产生的纵向位移,以某大跨度铁路悬索桥为背景,采用非线性动力时程分析法,考虑几何非线性和边界非线性,研究在货运列车移动荷载作用下,改变结构体系和约束体系对悬索桥纵向位移的控制效果。结果表明:结构体系方面,设置中央扣和水平拉索均可增大悬索桥结构纵向刚度,显著减小梁端纵向位移;设置中央扣还可减小缆、梁端纵向位移差,对纵向位移控制效果更优。约束体系方面,随着粘滞阻尼器速度指数减小,梁端纵向位移峰值逐渐减小;磁流变阻尼器对梁端纵向位移控制效果有限。采用2种阻尼器组合约束可控制列车过桥纵向位移同时不显著增加缆、梁端纵向位移差。
An existing long-span railway suspension bridge is used as a case to study the effective measures to control the oversized girder-end longitudinal displacement of the bridge of such type under moving train loads.With an nonlinear dynamic time-history analysis method,the effects of changing structural system and restraint system to control the girder-end longitudinal displacement of a suspension bridge under moving freight train loads were analyzed,considering the geometrical nonlinearity and boundary nonlinearity.It is shown that adding a central buckle and horizontal cables can improve the longitudinal stiffness of the stiffening girder and in turn alleviate the girder-end longitudinal displacement.The central buckle can also reduce the difference between the longitudinal displacements of the main cables and the girder-end longitudinal displacement,exhibiting better longitudinal displacement control effect.As the velocity exponent of the viscous dampers decreases,the peak values of girder-end longitudinal displacement gradually go down.The control effect of the magnetorheological dampers on the girder-end longitudinal displacement is limited.The combined utilization of these two types of dampers can effectively control the girder-end longitudinal displacement while train passing,but does not significantly enlarge the displacement difference between main cables and girder ends.
作者
汪珍
万田保
霍学晋
WANG Zhen;WAN Tianbao;HUO Xuejin(China Railway Major Bridge Reconnaissance&Design Group Co.,Ltd.,Wuhan 430056,China)
出处
《桥梁建设》
EI
CSCD
北大核心
2023年第S02期104-111,共8页
Bridge Construction
基金
中国中铁股份有限公司科技研究开发计划项目(2022-专项-01)
关键词
悬索桥
列车移动荷载
纵向位移
中央扣
水平拉索
粘滞阻尼器
磁流变阻尼器
非线性动力时程分析
suspension bridge
moving train load
longitudinal displacement
central buckle
horizontal cable
viscous damper
magnetorheological damper
nonlinear dynamic time history analysis
作者简介
汪珍,1995—,女,工程师,2017年毕业于东南大学工程力学专业,工学学士,2020年毕业于东南大学工程力学专业,工学硕士。研究方向:桥梁动力学行为分析,E-mail:wang_zhen0604@163.com;万田保,1966—,男,教授级高工,1988年毕业于西南交通大学铁道桥梁专业,工学学士,1992年毕业于西南交通大学桥隧及结构工程专业,工学硕士。研究方向:大跨度缆索承重桥,E-mail:wtb1966@163.com;霍学晋,1983—,男,教授级高工,2005年毕业于天津大学工业设计专业,工学学士,2007年毕业于天津大学桥梁与隧道工程专业,工学硕士,2011年毕业于西南交通大学桥梁与隧道工程专业,工学博士。研究方向:铁路桥梁设计理论,大跨度缆索承重桥受力行为分析,E-mail:huoxuejin@126.com
